FATFS 的几个函数用法：
FATFS *fs, fatfs;
fs = &fatfs;
f_mount(0, fs);
b = f_open(&infile,"SD.txt",FA_CREATE_NEW); //创建新文件
f_close(&infile); //关闭文件
b = f_open(&infile,"SD.txt", FA_WRITE); //以写方式打开文件
f_puts((char *)buff2,&infile); //文件内写入字符串
f_puts((char *)buff2,&infile); //文件内写入字符串
f_puts((char *)buff2,&infile); //文件内写入字符串
f_close(&infile); //关闭文件
b = f_open(&infile,"SD.txt",FA_WRITE); //以写方式打开文件
b = infile.fsize; //获得文件大小
f_lseek(&infile,b); //移动文件指针
f_puts(buff3,&infile); //从文件内数据的最后写入字符串
f_close(&infile); //关闭文件
b = f_open(&infile,"SD.txt",FA_READ); //以读方式打开文件
f_read(&infile,buff1,50,&rc); //从文件内读50字节赋给 buff1数组
f_close(&infile); //关闭文件
// f_unlink("SD.txt"); //删除文件
FATFS fs; // Work area (file system object) for logical drive
FIL fileuse; // file objects
unsigned char buffer[512]; // file copy buffer
unsigned int nfr, nfw; // File R/W count
void TestFATFS_Read(void)
{
//FILINFO finfo;
//DIR dirs;
//char name[]={"TEST.TXT"};
uint8_t result;
char path[50]={"0:/SD/BIN.TXT"};
printf("********* Test FATFS Read begin*************\n");
f_mount(0, &fs);
result = result;
if( (f_open(&fileuse,path, FA_OPEN_EXISTING |FA_READ))!=FR_OK) {printf("f_open() Failed !\n");return;}//以读方式打开文件
if( (f_read(&fileuse, buffer, sizeof(buffer), &nfr))!=FR_OK) {printf("f_read() Failed !\n");return;}
printf("%s\n",buffer);
f_close(&fileuse);
printf("********* Test FATFS Read over*************\n");
}
void TestFATFS_Write(void)
{
char path[50]={"0:/SD/BIN.TXT"};
unsigned char cont[]={"read write OK !"};
printf("********* Test FATFS Write begin*************\n");
f_mount(0, &fs);
if( (f_open(&fileuse,path, FA_OPEN_ALWAYS |FA_WRITE))!=FR_OK) {printf("f_open() Failed !\n");return;}//以读方式打开文件
if( (f_write(&fileuse, cont, sizeof(cont), &nfr))!=FR_OK) {printf("f_read() Failed !\n");return;}
f_close(&fileuse);
printf("********* Test FATFS Write over*************\n");
}
http://hi.baidu.com/mem2005/blog/item/e4343ba2480fc7b5caefd0fc.html